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  2. Positional notation - Wikipedia

    en.wikipedia.org/wiki/Positional_notation

    A digit's value is the digit multiplied by the value of its place. Place values are the number of the base raised to the nth power, where n is the number of other digits between a given digit and the radix point.

  3. Base ten blocks - Wikipedia

    en.wikipedia.org/wiki/Base_ten_blocks

    Wooden Dienes blocks in units of 1, 10, 100 and 1000 Plastic Dienes blocks in use. Base ten blocks, also known as Dienes blocks after popularizer Zoltán Dienes (Hungarian: [ˈdijɛnɛʃ]), are a mathematical manipulative used by students to practice counting and elementary arithmetic and develop number sense in the context of the decimal place-value system as a more concrete and direct ...

  4. Approximations of π - Wikipedia

    en.wikipedia.org/wiki/Approximations_of_π

    The best known approximations to π dating to before the Common Era were accurate to two decimal places; this was improved upon in Chinese mathematics in particular by the mid-first millennium, to an accuracy of seven decimal places. After this, no further progress was made until the late medieval period.

  5. Chronology of computation of π - Wikipedia

    en.wikipedia.org/wiki/Chronology_of_computation...

    Calculated 140 decimal places, but not all were correct 126 1794: Adrien-Marie Legendre: Showed that π 2 (and hence π) is irrational, and mentioned the possibility that π might be transcendental. 1824: William Rutherford [2] Calculated 208 decimal places, but not all were correct 152 1844: Zacharias Dase and Strassnitzky [2]

  6. Quinary - Wikipedia

    en.wikipedia.org/wiki/Quinary

    Quinary (base 5 or pental [1] [2] [3]) is a numeral system with five as the base.A possible origination of a quinary system is that there are five digits on either hand.. In the quinary place system, five numerals, from 0 to 4, are used to represent any real number.

  7. Significant figures - Wikipedia

    en.wikipedia.org/wiki/Significant_figures

    with the last significant figures in the ones place, tenths place, ones place, and thousands place respectively. (2 here is assumed not an exact number.) For the first example, the first term has its last significant figure in the thousandths place and the second term has its last significant figure in the ones place. The leftmost or largest ...

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